Foundry flask and method of manufacturing the same



Sept. 18, 1934. R. SMITH 1,974,292

FOUNDRY FLASK AND METHOD OF MANUFACTURING THE SAME Filed Aug. 3, 1931 2 Sheets-Sheet 1 INVEN TOR.

ATTORNEYJ.

I'. R. SMITH Sept. 18, 1934.

FOUNDRY FLASK AND METHOD OF MANUFACTURING THE SAME Filed Aug. 3. 1931 2 Sheets-Sheet 2' ATTORNEYS z q'gaa. 1 $52 Patented Sept. 18, 1934 UNiED STATES FOUNDRY FLASK AND METHOD OF MANU FACTURING THE SAME Irving R. Smith, Milwaukee, Wis., assignor to Sterling Wheelbarrow Company, West Allis, Wis.', a corporation of Wisconsin Application August 3, 1931, Serial No. 554,709

10 Claims.

This invention relates to improvements in foundry flasks and method of manufacturing the same.

In my former Patent Number 1,043,917, there is disclosed a foundry flask which is formed of a strip of rolled metal bent into a desired form with its ends joined together. One of the principal features described in this patent is the enlargement in cross section of the longitudinal middle portion of the strip to form a relatively heavy, solid, and compact rib extending entirely around the flask. It is obvious that any twist or torsion of the flask must twist the rib, and therefore use of the solid, centraHy positioned rib offers the maximum resistance to any torsional strain. Another feature of the above mentioned patent is the flanging of one or both edges of the strip to form said retaining ledges. The direction in which these flanges or ledges are to extend, whether inwardly or outwardly from the strip, varies for different types of work. For example, where ease of shake out is desired, it is preferable to have both the upper and lower ledges extending outwardly; Where it is desired that the sand be held in place at both the upper and lower portions of the flask sections then both ledges should extend. inwardly; and where it is preferable to have facility of inserting the sand in the flask and ease of shake out upon inversion, together with means for eliectively retaining the sand when the flask section is right side up, then the lower flange should be extended inwardly and the upper flange either extended outwardly or omitted entirely.

In my former patent, in order to provide all of the above mentioned variations, it was necessary to have on hand a large number of special strips of rolled metal of the various types of cross section- Furthermore, if flask sections of different heights was desired, it was necessary to keep on hand a great many additional strips of rolled metal of all the various heights and combinationsin each height, which was impractical.

It is, therefore, one of the objects of this invention to provide an improved method of manufacturing foundry flasks which makes it possible by carrying rolled strips of metalof but six different cross sectionaltypes to form flasks of practically any desired height within a given range and of any required cross sectional shape.

A further object of this invention is to provide an improved method as above described in which the twist resisting rib is always maintained in a substantially central position with respect to the height of the flask section regardless of the height of section being manufactured and regardless of the'cross-sectional type.

A further object of this invention is to provide an improved method of manufacturing foundry flasks which includes the use of central rib formed strips of one or more different widths; the use of edge strips of a plurality of widths and having preferably an angularly extending lange in connection therewith; and the welding "or otherwise securing of two or more of said standard strips together to form a flask section having a desired height and cross sectional shape and having the twist resisting rib located substantially centrally of the section.

A further object of this invention is to provide an improved foundry flask in which each section is formed of a plurality of elongated strips of rolled metal having a desired cross sectional 'area, one of said strips having a longitudinally extending twist resisting rib, and said sections being joined together along longitudinal lines while positioned in such a manner relative to one another as to maintain the rib substantially centrally of the height of the flask. V

I A further object of this invention is to provide an improved foundry flask which is simple in construction, strong and durable, inexpensive to manuafacture, and well adapted for the purpose described.

With the above and other objects in view; the invention consists of the improved foundry flask and method of manufacturing the same, and all its parts and combinations as set forth in the claims, and all equivalents thereof.

In the accompanying drawings in which the same reference numerals designate the same parts in all of the views:

Fig. 1 is a perspective view showing three strips of rolled metal assembled in proper relationship with one another prior to welding of the strips together;

Fig. 2 is a similar view showing the three strips after they have been united;

Fig. 3 is a perspective view on a smaller scale showing how one of the sections illustrated in Fig. 2 may be bent to form a flask section;

Fig. 4 is a plan View of a completed flask section with theadjacent ends joined together and fittings attached thereto;

Fig. 5- is a sectional view taken on line 55 of F .4;

Figs. 6 to 11 inclusive are sectional views showing the different types of roller metal stock which it is necessary to use in carrying out the improved method. 1

Figs. 12 to 24 inclusive are cross sectional views of various flask sections showing how flask sections of progressing heights may be manufactured by use of the rolled strips shown in Figs. 6 to 11 inclusive. i r Figs. 25 to 28 inclusive are cross sectional views of flask sections showing how the cross sectional shape may be varied as desired. 1

Figs. 29 to 31 inclusive are sectional views showledges 33.

ing how the cross sectional shape. of the-strips illustrated in Figs. 6 or 7 may be varied.

In carrying out the improved method, it is necessary to carry but six different types of rolledmeta1 strips. These strips may be originally furnished.

in lengths as desired, and may then be cut to suit requirements. illustrated in Figs. 1 and 6, and said strip is preferably 3 inches in width and is provided with a solid rib 31 having a 7 inch radius. Another type of central strip 30 is illustrated in Fig. 7, said strip being formed with the central rib 31, but being preferably 9 inches in width. In Fig. 8 the narrowest edge strip 32 is illustrated, said strip being preferably 1 inch in width and having a right angularly extending flange 33, and having one edge portion beveled as at 34. In Fig. 9 a similar type of strip 35 is illustrated, said strip, however, being 2 inches in width and having an identical flange 33 and beveled portion 34. Strips 36 and 37 are preferably 3 and 4 inches in width respectively, and said strips are also provided with the flanges 33 and beveled portions 34.

To manufacture a flask section of minimum height, one of the strips 30 illustrated in Fig. 6, and two of the strips 32 illustrated in Fig. 8, are utilized, as indicated in Fig. 1, the strips being preferably cut to desired lengths. Next, the strips are placed adjacent one another and longitudinally welded or otherwise secured together along lines 38 in the V-shaped recesses formed by the beveled edges 34 of the strips 32. This results in a strip having the twist resisting rib 31 extending substantially centrally, and having two upper and lower inwardly extending flanges or The strips thus welded together are then bent either into half flask sections or into full flask sections, as shown in Fig. 3. Next, the adjacent ends 39 are welded or otherwise secured together, and the usual lugs 40 and trunnions 41 may be welded or otherwise secured in position as shown in Figs. 4 and 5. This results in a completed flask section having a centrally disposed longitudinally extending twist resisting rib 31, and having sand retaining ledges 33 extending inwardly. Two of said sections may then be superimposed upon another as shown in Fig. 5, one section forming the cope 42, and the other section forming the drag 43 of a Z-part flask. In view of the fact that both of the ledges extend in wardly, this type of flask is particularly suited for work wherein it is desired that the sand be retained in position in both directions, and due to the use of the two flanges, this type of section may be readilyused for building up a plural section flask wherein the flanges or ledges form seats for the flask section above.

If it is desired to make a flask section having greater height but having substantially the same cross sectional shape with an outwardly projecting rib and upper and lower inwardly projecting ledges, this can be readily accomplished by use of only the six special strips of stock illustrated in Figs. 6 to 11 inclusive. Fig. 12 shows a cross section of a flask which is 5 inches in height. To manufacture a 6 inch flask, it is merely necessary to utilize the 3 inch central section 30, one of the 1 inch strips 32, and one of the 2 inch strips 35, asshown in Fig. 13. To make a '7 inch section, one of the 3 inch central strips is utilized and two of the 2 inch edge strips, as shown in Fig. 14. Thus the height may be progressively increased by'inches as further illustrated in Figs. 15 to 24 inclusive up to the section which has a height-of 17 inches shown in Fig. 7 24.

One form of central strip 30 is'.

It it is desired to vary the cross sectional shape of the flask section, this may be readily accomplished by reversing one or both of the edge strips as shown in Figs. 25 and 25, or by omitting one of the edge strips and forming the flask section of two strips only, as shown in Figs. 2'7 and 28. 'The flask section illustrated in Fig. 25 is particularly adapted for use where it is desired to obtain ease in inserting the sand, and ease in shake out when the flask section is inverted, and in which it is desired to have the lower flange extend inwardly to maintain the sand in position when the flask is upright.

The shape illustrated in Fig. 26 is particularly adapted for use where ease of shake out in both directions is desirable and where it, is desired that there be no hindrances during the ramming of sand into the flask. This type is alsowell adapted for use in building up plural section flasks.

The types shown in Figs. 2'7 and 28 are adapted for use where the extra strength obtained by the upper flange is unnecessary, and, where the lower flan e may be extended either inwardly .as in Fig. 27, or outwardiy as in Fig. 28 according to the requirements.

The different cross sectional shapes illustrate in Figs. 25 to 28 may also be readily increased in height without departing from the use of the special strips illustrated in Figs. 6 to 11, in the same maner as the height of the sections shown in Fig. 12 may be increased. With the forms illustrated in Figs. 2'7 and 28, however, the height can only be increased up to 13 inches.

All of the flask sections are preferably of an inch in thickness excepting at the points adjaeent the rib and flanges, and these sections are particularly adapted for use where resistance to strain is important, and where the weight of the flask section is relatively unimportant.

From the above it may be seen that by the provision of but six special types of strips, that an unlimited number of combinations may be effeet-ed, and that each combination may be made in practically any desired height in a given range, and that in any flask section manufactured the rib 31 is always positioned either exactly in the center of the section, or substantially in the center, as in the type shown in Figs. 13, 15, 17, 19, 21 and To obtain the range of possibilities with previous methods, it would be necessary to keepon hand strips of rolled metal of all the varying cross sectional types and of a great many different widths.

A further important advantage of the present improved flask and method of manufacturing the same resides in the provision of the beveled edges on certain of the strips to form a longitudinal recess for the welding operation. This is a great convenience and makes it possible for much more eflective welding to be done.

it is obvious that the six special strips utilized may be varied somewhat in shape, that the torsion resisting rib may be varied in form as shown in Figs. 29-31, and that the standard widths of these strips may be varied to meet requirements. It is also obvious that a lesser number of special strips may be kept in stock where it is not desired to have as great a range of possibilities, and also that a greater number may be provided and kept on hand where it is desired to increase the possibilities. Furthermore, each flask section may be made up of eithera single strip prepared and bent as above described, or of two strips each bent to form a half flask section, the ends of the two strips being suitably joined together to form the complete flask section. It is also to be understood that all other changes and modifications are contemplated as may come within scope of the claims.

What I claim is:

1. A foundry flask comprising a plurality of elongated strips of metal, one of said strips having a longitudinal edge beveled and juxtaposed to a longitudinal edge of an adjacent strip, said longitudinal edges being welded together within the V-shaped recess formed by the beveled edge and the welded together strips being bent to requisite form.

2. A foundry flask comprising an elongated central strip of metal having alongitudinalportion enlarged in cross section to constitute a relatively heavy, compact, twist resisting rib, and a pair of elongated edge strips each having their inner longitudinal edges beveled, said beveled edges being juxtaposed to the longitudinal edges of the central strip, and welded thereto within the V- shaped recesses formed by the beveled edges, one of said edge strips having its outer longitudinal edge formed with a flange the welded together strips being bent to requisite form.

3. The method of manufacturing foundry flasks consisting of providing strips of metal having a longitudinal portion enlarged in cross section to constitute a relatively heavy, compact, twist resisting rib, providing other strips having one longitudinal edge formed with a flange, welding the non-flanged longitudinal edge of one of said last mentioned strips to a longitudinal edge of one of said first mentioned strips with the strips so positioned with relation to one another as to cause the flange to project in a desired direction with respect to the rib, and bending said joined strips to requisite shape.

4. The method of manufacturing foundry flasks consisting of providing strips of metal having a longitudinal portion enlarged in cross section to constitute a relatively heavy, compact, twist resisting rib, providing other strips having one longitudinal edge formed with a flange and having the other longitudinal edge beveled, welding the beveled edge of one of said last mentioned strips to a longitudinal edge of one of said first mentioned strips with the strips so positioned with relation to one another as to cause the flange to project in a desired direction with respect to the rib, and bending said joined strips to requisite shape.

5. The method of manufacturing foundry flasks consisting of providing strips of metal having a longitudinal portion enlarged in cross section to constitute a relatively heavy, compact, twist resisting rib, providing other strips having one longitudinal edge formed with a flange, welding the non-flanged edge of one of said last mentioned strips to each of the longitudinal edges of said first mentioned strips with the strips so positioned with relation to one another as to J cause the flanges to project in a desired direction with respect to the rib, and bending said joined strips to requisite form.

6. The method of manufacturing foundry flasks consisting of providing a plurality of strips of metal of varying widths each having a longitudinal portion enlarged in cross section to constitute a relatively heavy, compact, twist resisting rib, providing a plurality of other strips of metal of varying widths each having a longitudinal edge formed with a flange, welding the non-flanged edge of a selected one of said last mentioned strips to a longitudinal edge of a selected one of said first mentioned strips to form the material for producing a flask section of a predetermined height with the strips so positioned with relation to one another as to cause the flange to project in a desired direction with respect to the rib, and bending said joined strips to requisite shape.

7. The method of manufacturing foundry flasks consisting of providing strips of metal each having a longitudinal portion enlarged in cross section to constiute a relatively heavy, compact, twist resisting rib, providing a plurality of other strips of metal of varying widths each having a longitudinal edge formed with a flange, welding the non-flanged edge of a selected one of said last mentioned strips to a longitudinal edge of one of said first mentioned strips to form the material for producing a flask section of predetermined height with the strips so positioned with relation to one another as to cause the flange to project in a desired direction with respect to the rib, and bending said joined strips to requisite shape.

8. The method of manufacturing foundry flasks consisting of providing a plurality of strips of metal of varying widths each having a longitudinal portion enlarged in cross section to constitute a relatively heavy, compact, twist resisting rib, providing other strips of metal each having a longitudinal edge formed with a flange, welding the non-flanged edge of one of said last mentioned strips to a longitudinal edge of a selected one of said first mentioned strips to form the material for producing a flask section of a predetermined height with the strips so positioned with relation to one another as to cause the flange to project in a desired direction with respect to the rib, and bending said joined strips to requisite shape.

9. The method of manufacturing foundry flasks consisting of providing a plurality of strips of metal of varying widths each having a longitudinal portion enlarged in cross section to constitute a relatively heavy, compact, twist resisting rib, providing a plurality of other strips of metal of varying widths each having a longitudinal edge formed with a flange, welding the non-flanged edge of a selected one of said last mentioned strips to each longitudinal edge of a selected one of said first mentioned strips to form the material for producing a flask section of predetermined height with the strips so positioned with relation to one another as to cause the flange to project in a desired direction with respect to the rib, and bending said joined strips to requisite shape.

10. The method of manufacturing foundry flasks consisting of providing a plurality of strips of metal of varying widths each having a longitudinal edge formed with a flange, providing a plurality of other strips of metal having nonflanged longitudinal edges, welding one of the longitudinal edges of one of said last mentioned strips with the non-flanged edge of a selected one of said first mentioned strips to form the material for producing a flask section of predetermined height, and bending said joined strips to requisite shape.

IRVING R. SMITH. 

